Extension-plank.



O. G. ANDERSEN.

EXTENSION PLANK.

APPLICATION FILED SEPT. 7, 1909.

962,691. Patented June 28,1910.

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UNITED STATES PATENT ()FFIQE.

CHARLES C. ANDERSEN, OF CHICAGO, ILLINOIS.

EXTENSION-PLANK.

Application filed September 7, 1909.

T 0 all whom it may concern:

Be it known that I, CHARLES C. ANDER- SEN, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements inExtension-Planks, of which the following is a specification.

My invention relates to extension planks, and may be advantageously usedin connection with ladders or sea-Holds employed by painters,paperhangers, and in fact any workmen who may have use for such adevice.

The object of my invention comprehends the production of a device ofthis character which will be rigid or steady as the workmen or usersmove thereover, and still be comparatively light and, when taken down,can be easily and readily carried from place to place.

In the drawing which forms a part of this specification, and in which myinvention is illustrated in its preferred form Figure 1 is a top planview of the plank showing the same partly extended; Fig. 2 is asectional view taken on the line 3-3 of Fig. 1; Fig. 3 is a sideelevation of the outer section; Fig. at is a similar view of the innersection, and Fig. 5 is an end view of the inner end of the outersection.

structurally speaking, my invention as shown in the drawings, consistsof an outer and an inner section 1 and 2, respectively, which areprovided with means, to be hereinafter referred to, whereby the saidsections may be extended to suit the conditions of different places inwhich my plank may be used, or contracted in order that the same may beeasily moved from place to place.

Each of the sections 1 and 2 comprises parallel side bars 3 and 4,respectively. These side bars may be of any desired length, and arebridged across their upper edges by transverse boards 5, thereby forminga solid platform.

Passing over each of the ends of the outer section 1 is a metal band orstrap 6 which is securely fastened thereto by any suitable means, andwhich serves the purpose of stifiening or strengthening the section. Theends of the band on the inner end of the section extend a short distanceinwardly beyond the inner faces of the side bars 3, as indicated at 6for a purpose to be hereinafter referred to. Formed in the innerSpecification of Letters Patent.

Patented June 28, 1910.

Serial No. 516,631.

faces of each of the sides bars 3, and near their upper edges is alongitudinal groove 7.

Passing under each end of the inner section 1 and extending upwardly onthe outer faces of the side bars a to near the upper edges thereof, is ametal band or strap 8. That portion of these bands which extend alongthe side bars 1 fit in recesses formed therein so that the outer facesof the side bars 4: will be flush with the bands. The ends of the bandsor straps 8 are bent outwardly at right angles to the side bars to formlips, as indicated at 8 and the lips S on one of the bands or straps areadapted to occupy a position within the aforesaid grooves 7, therebyslidably supporting the section 2 within the section 1.

To prevent the section 2 from being drawn clear out of the section 1, Iprovide each of the side bars 3 of said section 1 with screws or stops9, which are adapted to extend through the grooves 7 so that when thesection 2 is to be extended it can only be withdrawn until the edges ofthe lips 8 engage the sides of the stops 9.

In assembling the sections, the band or strap on one end of the section2 is left off. This end of said section 2 is then slid through thesection 1 from the outer end thereof, until it projects beyond the innerend of the section 1. The band or strap is then fastened on and thesection 2 cannot slide back outof the section 1 for the reason that theedge of the band or strap will engage the edges of the extended portions6 of the band 6. The screws or stops 9 are then placed in the side bars3 of the section 1. By this arrangement it will be seen that the section2 can only be extended until the lips 8' come in contact with the screwsor stops 9, and is prevented from sliding out of the opposite end of thesec tion 1 by the strap 8 coming in contact with the extensions 6 of thestrap 6.

Vhile I have only shown my invention as applied to a two section plank,it will be understood that another section similar to the section 1 maybe used on the other end of the section 2, thereby forming a threesection plank, and no limitation is implied by reason of the particularstructure shown.

I claim:

1. In an extension plank, the combination with an outer and an innersection mounted in slidable relation, each consisting of parallel sidebars connected on their upper edges by transverse boards, bands orstraps secured to the ends of the sections, longitudinal grooves formedin the inner faces of the side bars of the outer section, lips formed onthe bands or straps of the inner section and adapted to enter saidgrooves to permit the said inner section to be eX- tended, and stopspassing through the grooves to limit the movement of said inner section.

2. In an extension plank, the combination with an outer and an innersection mounted in slidablc relation, each embodying parallel side bars,the said bars of the outer section having grooves upon their innersurfaces, straps secured to each of the said sections, the straps of theouter section having extensions supporting the inner section, and thestraps of the inner section having lips projecting Within the grooves ofthe bars of the outer section.

In testimony whereof I aflix my signature, in presence of two Witnesses.

CHARLES C. ANDERSEN. Witnesses:

ARTHUR lVEsLEY, JosErH O. GLENN.

